Backstop for transfer tail clamping apparatus



July 1, 1969 E, E, Smgs 3,452,784

BACKSTOP FOR TRANSFER TAIL CLAMPING APPARATUS med June 30, 1967 INVENTOR. EVERETT E. 31025 Arron/vars.

United States Patent 3,452,784 BACKSTOP FOR TRANSFER TAIL CLAMPING APPARATUS Everett E. Sides, Greenville, S.C., assignor to Textile Specialties, Inc., Greenville, S.C., a corporation of South Carolina Filed June 30, 1967, Ser. No. 650,325 Int. Cl. D0311 45/26 US. Cl. 139-247 1 Claim ABSTRACT OF THE DISCLOSURE A backstop for a transfer tail clamping apparatus used on a bobbin replenishing mechanism. The backstop is so constructed that the transfer tail is wedged thereagalnst when the clamping apparatus engages such.

This invention relates to an abutment or backstop which cooperates with a clamping apparatus on a bobbin winding machine for holding the end of a transfer tail of a bobbin and the like, when the bobbin is being transferred.

During a cloth weaving operation when a bobbin is inserted in a shuttle on a loom it is necessary to hold the end of the transfer tail of the yarn carried by the bobbin during them maiden voyage or first pick of the shuttle. Normally, on automatic bobbin Winding mechanisms associated with looms the end of the transfer tail is held by a clamping mechanism during this first pick. One of the problems encountered in clamping mechanisms, here tofore used, was the jaws of the clamp occasionally bounced apart slightly when the clamp was closed. When the clamping mechanism bounced, the transfer tail Was occasionally dropped, and as a result the loom was shut down automatically. Thus, it can be seen that it is extremely important that the clamping mechanism positively grip and hold the transfer tail each and every time during the bobbin transfer operation.

Heretofore, clamping mechanisms utilized incorporated a clamping rubber pad which was brought in contact with a rubber pad carried on an abutment or backstop to engage the end of a transfer tail therebetween. Some strands being wound caused a groove to wear in the rubber pads and eventually such, in turn, caused the strand to be dropped or slipped during the maiden voyage of the bobbin. This caused the loom to be shut down.

Another problem with clamping mechanisms, heretofore, utilized is that they did not provide a positive gripping action for all types of strands. As a result, when certain strands were being used the clamping mechanism would sometimes drop such.

On conventional looms provided with winding mechanisms after the maiden voyage of the bobbin a knife cuts the strand close to the cloth and an air tube sucks the end of the transfer tail off a tensioning drum which is provided for properly positioning the transfer tail prior to transfer. The very end of the transfer tail is normally wrapped on the drum and moves downwardly on the drum as it is rotated. If the end of the transfer tail is not removed from the drum after the strand has been cut, the transfer tail will wrap around the bottom of the drum causing accumulations of such thereon, and eventually causing the drum to drop some transfer tails before transfer. Thus, it can be see that it is desirable to insure that the end of the transfer tail will be removed from the drum by the pneumatic means after the transfer tail or strand has been cut.

One clamping mechanism, heretofore, utilized is illustrated in Figures 7, 9, 20 and 21 of Patent No. 2,638,- 936 granted to Goodhue et a1., and issued on May 19,

3,452,784 Patented July 1, 1969 1953. An improved model of the device, illustrated in the patent, is manufactured by Leesona Corporation, and is generally referred to as the Unifil Loom Winder having a Model No. 791.

Accordingly, it is an important object of the present invention to provide an improved abutment or backstop for cooperating with a clamping mechanism for holding the transfer tail of a bobbin when a bobbin is being transferred.

Another important object of the present invention is to provide an improved abutment or backstop which cooperates with the clamping mechanism to aid in breaking the very end of a transfer tail loose from the tensioning drum of a winding machine after transfer of a bobbin or the like.

Still another important object of the present invention is to provide an abutment or backstop which cooperates with a yarn clamping mechanism which minimizes the wear on a pad carried by the clamping mechanism.

The invention will be more readily understood from a reading of the following specification, and by reference to the accompanying drawing forming a part thereof, wherein an example of the invention is shown and wherein:

FIGURE 1 is a front perspective view of .a portion of an automatic loom winder illustrating the clamping mechanism and an abutment constructed in accordance with the present invention,

FIGURE 2 is a side elevational view of the abutment constructed in accordance with the present invention, the yarn clamp illustrated in an open position, and the mechanism for actuating such, and

FIGURE 3 is a side elevational view of the yarn clamping mechanism illustrated in a closed position.

The drawing illustrates a transfer tail clamping apparatus for use with a bobbin replenishing mechanism for engaging a transfer tail of a bobbin and the like, when thebobbin is being transferred. The bobbin replenishing mechanism has an abutment or backstrop A carried thereon, adjacent the normal path of the transfer tail of the bobbin. A movable frame B is carried by the bobbin replenishing mechanism. Means C is provided for shifting the movable frame to a forward position when the bobbin is being transferred. A clamping member or apparatus is carried opposite the abutment A. The movable frame B has a connection for providing relative movement between the abutment A and the clamping member for engaging and holding the transfer tail between the abutment A mad the clamping member when the frame is shifted to the forward position. The abutment includes a vertical support and spaced opposed flange members each having one side fixed with an edge of the vertical support. The other sides of each of the flange members extend towards the clamping member. The transfer tail of the bobbin is posi tioned adjacent the other sides of the flange members when the clamping member is spaced from the abutment A. The clamping member includes a first supporting member D and a second supporting member E positioned in spaced aligned relation to the first supporting member D. A positioning member F is carried adjacent each end thereof, by the first and second supporting members D and E, respectively. At least one of the ends of the positioning member F is slidably carried by a respective supporting member. A spring G is carried by the positioning member F between the first and second supporting members. The clamping member has a bumper H of a smaller width than the space between the space flange members of the abutment A which engages the transfer tail and wedges such between the flange members of the abutment during transfer of the bobbin.

In the particular embodiment illustrated, the transfer tail clamping apparatus is being used with a Unifil Model No. 791 Loom Winder, which is manufactured by Leesona Corporation of Warwick, R.I. The loom winder automatically winds yarn on bobbins and maintains a supply of full bobbins which are automatically transferred to the shuttle on the loom as the filling in the running shuttle is nearly exhausted. Each of the bobbins waiting to be transferred to the shuttle has a transfer tail 10, the end of which is held by a gripping mechanism carried by a tensioning drum 11. Only the transfer tail of the lowermost bobbin carried in the bobbin magazine is illustrated in FIGURE 1. When the bobbin is transferred to the shuttle it is necessary that the end of the transfer tail be held stationary so that it can be threaded in the eye of the shuttle. It is, also, necessary that the transfer tail be held stationary during the first pick of the shuttle. Such is the purpose of the clamping apparatus, generally referred to by reference numeral 12, and the abutment A constructed in accordance with the present invention. After the bobbin has made its maiden voyage or first pick of the shuttle, the strand 10 is cut adjacent the cloth. A conventional pneumatic suction device (not shown) is mounted adjacent the winder for pulling the end of the transfer tail off of the tensioning drum 11 after such is cut. This suction device is generally mounted between the clamping device and the cloth being woven.

An abutment A constructed in accordance with the present invention is carried on the frame 13 of the bobbin replenishing mechanism for cooperating with the clamping apparatus 12 to hold the transfer tail of the bobbin therebetween. The abutment A has a horizontal leg 14 which terminates in a vertical support 15. The horizontal leg 14 is secured to the frame 13 by any suitable means, such as screws 14a. A pair of spaced opposed flange members 16 are fixed by one side with an edge of the vertical support 15. The other side of each of the flange members 16 extend towards the clamping member 12. The transfer tail 10 of the bobbin being transferred is positioned adjacent the outer edges of the flange members 16 when the clamping member is spaced from the abutment A. The outer edges of the flange members 16 are beveled inwardly slightly so as to guide a rubber pad H carried on the clamping apparatus 12 therebetween when the clamp is closed. A step 16a is mounted on the side of the abutment A for preventing the end of the transfer tail from running off of the drum 11. It is noted that the abutment A, as well as the complementary surface H on the clamping mechanism, tilts slightly backwards for accommodating the transfer tail.

A movable frame B is carried by the bobbin replenishing mechanism and such is shifted to the right in order to close the clamping member which is attached to its outer end. A vertical leg 17 is integral with the outer end of the movable frame B and has two vertically spaced apertures therein for receiving bolts 18 or the like, for attaching the clamping member thereto. The movable frame has a flat main body portion 19 with a pair of spaced vertical posts 20 and 20a, respectively, adjacent the inner end. The vertical posts have aligned apertures therein for receiving a horizontal rod 21 upon which the frame slides during opening and closing of the clamping apparatus. The horizontal rod 21 has its ends suitably secured to the casing of the bobbin replenishing mechanism. The movable frame 13 has laterally spaced side walls 22 and 23, respectively, integral therewith. A laterally extending rod 24 is carried between the side walls 22 and 23 for accommodating apparatus utilized in shifting the frame. Such is discussed in more detail below.

The jaws of the clamp are open when the slack end of the yarn is drawn thereinto prior to the bobbin being transferred into the shuttle. The clamping apparatus is held in the open position by a latching mechanism and the bobbin replenishing mechanism is provided with means C for shifting the movable frame B to a forward position when the bobbin is being transferred. The latching or cocking mechanism comprises a lever 25 which is freely carried on a rockable rod 26. A laterally extending pin 27 is carried in the medial portion of the lever 25 and engages a notch 28 in a latching lever 29 pivoted on a stud 30. The end of the lever 25 is bifurcated for accommodating the lateral rod 24 carried on the movable frame. The lever also has a guiding member 31 protruding out from its side which extends over a vertically extending portion of the side wall 23 carried by the movable frame B. A rearwardly extending arm 32 is integral with the top of the lever 25 and has a notch 33 therein for receiving one end of a spring 34. The other end of the spring 34 is suitably secured to a stud 35 extending inwardly from the casing of the bobbin replenishing mechanism. Another spring 36 is carried between the end of the latching lever 29 and a stud 37 which is located adjacent the top of the bobbin replenishing mechanism.

A rearwardly extending arm 38 is fixed to the rockable rod 26 for rotation therewith. A linking member 39 has one end pivotally connected to the arm 38 and the other end pivotally connected to the end of the latching lever 29. The rockable rod 26 is connected to be rocked by the transfer hammer (not shown) associated with the bobbin replenishing mechanism for the loom and is rotated in a clockwise direction when a bobbin is being transferred. Such causes the latching lever 29 to be depressed by means of the linking member 39 and the arm 38. When the latching lever is depressed the pin 27 is allowed to escape from the notch 28 and the spring 34 causes the lever 25 to be pivoted in a counterclockwise direction. When the lever is rotated in a counterclockwise direction the jaws of the clamping apparatus are closed from the open position illustrated in FIGURE 2 to the closed position illustrated in FIGURE 3. During the unlatching operation the pin 27 rides up on the upper-surface of the latching lever 29 against the tension in the spring 36. It is also noted that during the unlatching operation the movable frame slides forwardly on the rod 21 from the position illustrated in FIGURE 2 to that of FIGURE 3. The abovementioned action takes place as a bobbin is being transferred into the shuttle of the loom.

In order to restore the clamping apparatus to its open position a finger 40 is pivotally carried on the laterally extending rod 24. A small spring 41 is connected between the body of the finger 40 and a lower portion of the latching lever 29. When the latching lever is in the position illustrated in FIGURE 2 the spring 41 causes the finger to be pivoted upwardly out of the path of a hunter 42 carried on the lay 43 of the loom. When the latching lever 29 is in the position illustrated in FIGURE 3 the spring 41 causes the rearward end of the finger 40 to be pivoted downwardly into the path of the hunter carried on the lay 43. When the lay moves forwardly on the next stroke the hunter 42 will engage the finger 40 causing the movable frame B to slide to the left, which in turn, causes the lever 25 to be pivoted in a clockwise direction until the pin 27 carried thereon is locked in the notch 28 carried on the latching lever 29.

The above-mentioned latching and unlatching mechanism forms no part of the present invention, and is standard mechanism in the abovementioned Unifil Loom Winder.

Heretofore, the clamping apparatus normally carried on the movable frame B occasionally dropped the transfer tail of the bobbin when such was closed, thus causing the loom to be shut down. It is extremely important that the clamping apparatus engage the transfer tail each and every time that a bobbin is being transferred so as to achieve the maximum efiiciency of the loom. One belief for the cause of the clamping mechanism to occasionally drop the transfer tail is that a bouncing action takes place when the clamping jaws are closed. Thus, one of the purposes of the subject invention is to provide a positive gripping between the jaw of the clamping member and the abutment A with a minimum amount of bouncing.

The clamping member is carried on the movable frame B opposite the abutment A. The clamping member includes a first supporting member D which is attached by means of a vertical leg 44 to the vertical leg 17 carried on the movable frame. Such attachment may be made by any suitable means, such as bolts 18. Displaced laterally from the vertical leg 44 is an enlarged vertical supporting member 45 which is connected to the vertical leg 44 by means of a horizontal member 46. The supporting member 45 has two vertically spaced apertures therein for receiving the positioning member F.

The positioning member F includes a pair of rods 47 and 48, which extend through the apertures in the supporting member and are slidably carried by such. Enlarged heads 48a are carried on the rods for restricting the movement of the rods in a forward direction. The other end of the rods 47 and 48 are reduced and have threads thereon for receiving nuts 50 for securing the second supporting member E in spaced aligned relation to the first supporting member D, and providing a fixed connection between the rods and the second supporting member E. A second supporting member E is U-shaped and has a pair of vertically spaced apertures in one leg for accommodating the reduced ends of the rods 47 and 48, respectively. A spring G is carried on each of the rods 47 and 48 interposed between the vertical supporting member 45 and the second supporting member E normally urging the supporting members apart.

A bumper H is carried on the other leg of the U-shaped second supporting member and has a corrugated front surface. The bumper is constructed of a resilient rubber material, and takes the configuration of a sleeve. Such is slipped onto the outer leg of the U-shaped second supporting member E and fits snugly thereon. The abutment A is constructed of any suitable material, such as steel.

In operation, when a fresh bobbin is being transferred to a shuttle on the loom the rod 26 is rocked by the transfer hammer depressing the latching lever 29. Such permits the spring 34 to rotate the lever 25 in a counterclockwise direction sliding the movable frame to the right for closing the jaws of the clamping apparatus. The bumper H carried on the second support member E has a width slightly less than the space between the outwardly extending flange members 16 and wedges the end of the transfer tail against the inner-walls of the flanges 16, as well as against the vertical support 15. Such causes a positive gripping of the strand and, also, pulls a small length of yarn or strand off of the tensioning drum 11. This aids the suction mechanism associated with the winder in pulling the end of the transfer tail off of the drum when the clamping apparatus is open. Such minimizes drum wraps which would accumulate on the bottom of the drum if the transfer tail was not removed.

When the bumper H carried on the second supporting member E strikes the abutment A the springs G are compressed as the rods 47 and 48 slide through the apertures in the vertical supporting member 45. Such compression of the spring G and slight movement of the engaging bumper H produces a positive engagement of the transfer tail between the bumper H and the abutment A. The compression of the springs minimizes bouncing when the clamping mechanism is closed, providing an extremely reliable transfer tail clamping apparatus. Since the clamping apparatus is capable of being compressed, such catches the transfer tail sooner than conventional clamps and holds the transfer tail longer during the bobbin transfer operation.

The abutment A constructed in accordance with the present invention has been described cooperating with a particular clamping apparatus 12; however, it is to be noted that other suitable clamping apparatus could be utilized.

While a preferred embodiment of the invention has been described using specific terms such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claim.

What is claimed is:

1. In combination with a transfer tail clamping apparatus for use with a bobbin replenishing mechanism for engaging a transfer tail of a bobbin and the like when said bobbin is being transferred, said bobbin replenishing mechanism having a clamping member carried thereon, a movable frame carried by said bobbin replenishing mechanism, and means for shifting said movable frame to a forward position when said bobbin is being transferred, the improvement including: an abutment carried opposite said clamping member, said movable frame having connection for producing relative movement between said abutment and said clamping member, said abutment including a vertical support, spaced opposed vertical flange members each having one side carried by said vertical support, the other side of each of said flange members extending toward said clamping member, said transfer tail of said bobbin being positioned across said other sides of said flange members when said clamping member is spaced from said abutment, and said clamping member having a bumper of a smaller width than the space between said spaced flange members for engaging said transfer tail and wedging said transfer tail between said flange members during transfer of said bobbin.

References Cited UNITED STATES PATENTS 796,004 8/1905 Northrop 139-194 859,570 7/1907 Mills 139-194 2,522,290 9/1950 Mabry 139-194X 2,638,936 5/1953 Goodhue et al. 139-224 2,766,779 10/1956 Goodhue et a1. 139-247 3,025,888 3/1962 Thibault 139-257 3,411,550 11/1968 Jenkins 139-247 JAMES KEE CHI, Primary Examiner.

US. Cl. X.R. 139-224, 256 

